Crank-pin lubricator



Nov.19,1929 EP. HOESCH 1,736,174

QRANK PIN LURICTOR Filed Dec. 7. 1922 Patented Nov. 19, 1929 FRANK P. ROESCH, 0F CHICAGO, ILLINOIS, ASSIGNOR TO IEAlxlffr VISSERING AND y (ZOIVLI'ANY7 OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS CRANK-PIN LUBRICATOR Application filed..k December The present invention relates generally to crank-pin lubricators for use in connection` with locomotives and other such mechanisms, and more particularly to that type of lubricator which embodies a slidable piston having a weight therein movable up and down by the rotation of the crankpin and operable during such movement to tap the piston against the grease so as to feed the latter to the crank-pin bearing.

The object of the invention is to provide a lubricator of the aforementioned character, which is of new and improved construction, and in which the face of the piston adjacent the grease embodies an undercut cavity operative to receive a portion of the grease soV as to lock the same therein andcause the piston to adhere to the main body of the grease during the rotation' of the cranlr-pin. Y i

Other objects and the various advantages and characteristics of the present lubricator construction will be apparent from a consideration of the following detailed description.

The invention consists in the several novel features hereinafter set forth andv more particularly defined by the claims at the conclusion hereof.

. connected to the cranlcpin 6-of a locomotivewheel 7. The rod is provided with an upwardly extending boss 8 in which a chamber 9 is formed for the grease used to lubricate the cranlcpin 6. The chamber 9 is connected to the bearing for the crank-pin by a duct 10. A cap or plug 11 is provided with a flange 12 to seat on the upper or outer end of boss 87 is screw-threaded to the boss, as at 13, is adapted to close the upper end of the chamber 7, '19225 i serial No. 605,388.

inthe bossa-nd is extended inwardly or downwardly to' form a cylinder 14:. A plunger or pistonl is slidably held in and substantially fits yin the cylinderld. kA stem 16- on the plunger extends through-and is adapted to slide in cap 11,-so that the outer end of the stem will be accessible at allv times. yThe lower or inner faceofV plunger ltis provided with an annular undercut channell? into which the grease will be forced. lThe channel 17 is undercutor'convergent towards lthe grease in Y cylinder 14 to cause the lgrease to adhere to the plunger'and retard the outward or upward movementthereof.; A'cavity orpoclretlS is formed in the lower end of the plunger, the top ofpwhich isclosed and the lower end of which' is closedl by a screw plug 19. .The head of plug 19 is disposed in an undercut pocket y20 whichcau'ses additional retardation by the grease to the upward movement of the plunger'. r A .ball or weight 21"is confined *in cavity 18 and is movablelvertically therein n Vbetween plug 19 and the top ofthe cavity.` A pin 22 passes through'the upper end of stem 16 to enable the operator vto pull the piston upwardly in cylinder 14 when desired.

The operation ofthe ylubricating device is The chambery 9y is filled with v as follows: grease and the cap11`is then forced down to close the chamber to force the grease into .channell and pocket 2O yand simultaneously put sufficient .initial pressureon they grease to feed it through duct-10 for initial lubrication ofthe crank pin; At this time7 the` plunger 15'will be held in the upper end of cylinder 9'. l/Vhen the locomotive starts and the-drive wheels begin to revolve, centrif- -ugal force caused by the rotation offthe crank-pin will cause the ball 21 to alternately lrise andfall in cavity 18. That is7 when the cranlrpin isbelow the wheel axis7 centrifugal force will cause theball' to tap and bear against the plug 19, thus exerting a pressure upon the plungerf to compact the greasein chamber 9, and when the ball is passing over the centerv of the wheel axis, lcentrifugal force will cause .it to rise in cavity 18. The outward movement Vof the plunger will be resisted by adhesion. ofthel grease' in and belowthe`plunger,.so that vthe ball will Y pin toA force automatically the piston against deliver a light blow or tap to the screw-plug 19 to force the plunger downwardly in cylinder 14. This tapping will causethe grease te be forced automatically and supplied to the crank pin during the operation of the locomotive.. When the locomotive isstopped, the forcing of the grease to the crank pin automatically ceases. By adjusting screw plug 19 inwardly or outwardly, the force of the tap or blow produced by the ball may be varied as desired.

In the modification shown in Fig. 4, the y,

plunger I5 operates directly in the cylindrical wall 14 ofthe boss 8', in lieu of operating in a cylinder onv the cap. In this modification, thecylindrical wall is omittedl fromA the cap 115. In practice, the plunger is usually formed of light metal, such as aluminum, and

the-outer end ofthe plunger stem is Vdrilled or'v bored away to decrease its weight.V

The invention exemplifies a lubricating device for crank-pins, in which the pressure upon the grease. is controlled by the rotation of the crank-pin or Vwheel by which it is carried, so thatV the press-ure will automatically cease'when the crank-pin is stationary and tially the crank-pin whenever desired. vThe invention isnot to be understood as re- November, 1,922.

movable vertically by vthe rotation of the crank-pin, the under side of the piston being provided with an annular cavity having its walls converging toward the grease in the receptacle and into which a portion of the grease will be forced; to causethe pistonyto yadhere to the grease in the receptacle during rotation of the pin. Y

Signed at Chicago, Illinois thislS'thdayof FRANK P. RoEscH.

stricted to the details. set forth, since these maybe modified within the scope 0f the apV pended claims-, without departing from the spirit and scope ofthe invention. v

Having thus described! the invention, what I claimI as new and desire to secu-re by Letters Patent, is:

l. In al lubricating device for acrank-pin bearing, the combination of a .grease recep- Y tacle, a piston for feeding the grease, mounted to. slide longitudinally in the i receptacle,

meansfoperative during-rotation of the crankthey grease, said piston having in the face thereof which iscontiguous to. the grease, a

cavity into which a portion. of the grease is v forced, the sidewalls of the cavity converging towards the grease in. the receptacle to loclrsaid portion ofv the grease in the cavity 'so that the piston adheres tothe greaseand is prevented from separating therefrom during krotationof the crank-pin. 2. In a lubricating device for a crank-pin bearing, the combination of a grease receptacle, la piston disposed in s-aid receptacle for feeding the grease, la stem extending up,- wardly from said piston, the piston being provided with a chamber extending upwardly into the stem, and aweight in the chamber 

